WO2024077669A1 - Embedded sleeper for ballastless track - Google Patents

Embedded sleeper for ballastless track Download PDF

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Publication number
WO2024077669A1
WO2024077669A1 PCT/CN2022/128117 CN2022128117W WO2024077669A1 WO 2024077669 A1 WO2024077669 A1 WO 2024077669A1 CN 2022128117 W CN2022128117 W CN 2022128117W WO 2024077669 A1 WO2024077669 A1 WO 2024077669A1
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WIPO (PCT)
Prior art keywords
light
sleeper
ballastless track
embedded
steel bars
Prior art date
Application number
PCT/CN2022/128117
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French (fr)
Chinese (zh)
Inventor
王继军
尤瑞林
刘伟斌
高睿
王彦辰
王云林
宁娜
王梦
高志国
张镇
伍卫凡
张海磐
杜香刚
范佳
刘海涛
赵磊
施成
易强
袁家钰
Original Assignee
中国铁道科学研究院集团有限公司铁道建筑研究所
中国铁道科学研究院集团有限公司
中国铁路国际有限公司
中国铁路设计集团有限公司
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Application filed by 中国铁道科学研究院集团有限公司铁道建筑研究所, 中国铁道科学研究院集团有限公司, 中国铁路国际有限公司, 中国铁路设计集团有限公司 filed Critical 中国铁道科学研究院集团有限公司铁道建筑研究所
Publication of WO2024077669A1 publication Critical patent/WO2024077669A1/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
    • E01B3/32—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
    • E01B3/32—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement
    • E01B3/34—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement with pre-tensioned armouring or reinforcement

Definitions

  • the utility model relates to the technical field of track engineering, in particular to an embedded sleeper for a ballastless track.
  • the ballastless track structure has the advantages of high smoothness, strong structural durability, less maintenance workload, low maintenance cost, track structure stability, continuity and long service life.
  • the utility model provides an embedded sleeper for a ballastless track, which solves the technical problems that after the existing ballastless track is laid, the gap between the bonding surface of the light sleeper and the roadbed is large and the connection strength is low.
  • a ballastless track embedded sleeper comprising: a light sleeper body and a plurality of connecting parts
  • the light pillow body is a rectangular parallelepiped structure; a plurality of connecting members are fixed at intervals on two opposite sides of the light pillow body in the length direction.
  • the beneficial effect of the utility model is that by fixing a plurality of connecting pieces at intervals on both sides of the length direction of the light rail body, the bonding performance of the new and old concrete bonding surfaces between the sleeper body and the cast-in-place ballast can be enhanced, and the connection strength between the light rail sleeper body and the cast-in-place ballast can be improved.
  • the present invention can also be improved as follows.
  • the connecting member is a connecting steel bar, and a plurality of the connecting steel bars are pre-interval-ed and buried inside the light pillow body along the width direction of the light pillow body, and a plurality of the connecting steel bars extend out from two opposite sides of the length direction of the light pillow body.
  • the diameter of the plurality of connecting steel bars is 6-50 mm and the protruding length is 50-250 mm.
  • the connecting member is an anchoring body
  • the cross-section of the anchoring body is triangular, rectangular or trapezoidal
  • a plurality of the anchoring bodies are integrally formed on opposite sides of the length direction of the light pillow body.
  • the length of the plurality of anchor bodies extending out of the light pillow body is 50-250 mm.
  • it also includes a plurality of prestressed steel bars, which are all pre-buried inside the light pillow body along the length direction of the light pillow body, and extend out from both ends of the light pillow body in the length direction.
  • the length of the plurality of prestressed steel bars extending out of the light pillow body is 50-250 mm.
  • the further beneficial effect of adopting the above method is that by fixing multiple prestressed steel bars inside the light sleeper body and extending them out of both ends of the light sleeper body in the length direction, on the one hand, the structural strength of the light sleeper body can be improved, and on the other hand, the bonding performance of the new and old concrete bonding surfaces between the sleeper body and the cast-in-place ballast can be enhanced, thereby improving the connection strength between the light sleeper body and the cast-in-place ballast.
  • FIG1 is a side view of a type 1 embedded sleeper for ballastless track according to the present invention.
  • FIG2 is a side view of type 2 of a ballastless track embedded sleeper according to the present invention.
  • FIG3 is a top view of type 1 of a ballastless track embedded sleeper according to the present invention.
  • FIG4 is a top view of type 2 of a ballastless track embedded sleeper according to the present invention.
  • FIG5 is a top view of type 3 of a ballastless track embedded sleeper according to the present invention.
  • FIG. 6 is a top view of type 4 of a ballastless track embedded sleeper according to the present invention.
  • a ballastless track embedded sleeper includes: a light sleeper body 1 and a plurality of connecting parts 2,
  • the light pillow body 1 is a rectangular parallelepiped structure; a plurality of connecting members 2 are fixed at intervals on two opposite sides of the light pillow body 1 in the length direction.
  • the connecting member 2 can be a connecting steel bar, and multiple connecting steel bars are pre-interval-buried inside the light pillow body 1 along the width direction of the light pillow body 1, and multiple connecting steel bars extend out from opposite sides of the light pillow body 1 in the length direction.
  • the diameter of the plurality of connecting steel bars may be 6-50 mm, and the protruding length may be 50-250 mm.
  • the connecting member 2 may be an anchoring body, the cross section of which is triangular, rectangular or trapezoidal, and a plurality of anchoring bodies are integrally formed on opposite sides of the light pillow body 1 in the length direction.
  • the length of the multiple anchor bodies extending out of the light pillow body 1 can be 50-250 mm.
  • multiple prestressed steel bars 3 may also be included.
  • the multiple prestressed steel bars 3 are all pre-buried inside the light pillow body 1 along the length direction of the light pillow body 1, and the multiple prestressed steel bars 3 extend out from both ends of the length direction of the light pillow body 1.
  • the length of the plurality of prestressed steel bars 3 extending out of the light pillow body 1 can be 50-250 mm.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
  • Machines For Laying And Maintaining Railways (AREA)

Abstract

An embedded sleeper for a ballastless track, relating to the technical field of track engineering, and comprising: a light sleeper body and a plurality of connecting members. The light sleeper body has a cuboid structure; and the plurality of connecting members are fixed at intervals on two opposite sides of the light sleeper body in the length direction thereof. The plurality of connecting members are fixed at intervals on the two sides of the light sleeper body in the length direction thereof, such that the bonding performance between new and old concrete binding surfaces of the light sleeper body and a cast-in-place track bed can be enhanced, and the connection strength between the light sleeper body and the cast-in-place track bed is improved.

Description

一种无砟轨道埋入式轨枕Embedded sleeper for ballastless track 技术领域Technical Field
本实用新型涉轨道工程技术领域，特别涉及一种无砟轨道埋入式轨枕。The utility model relates to the technical field of track engineering, in particular to an embedded sleeper for a ballastless track.
背景技术Background technique
无砟轨道结构具有平顺性高，结构耐久性强，维修工作量少，维护费用低，轨道结构稳定性、连续性和使用寿命长等优点。The ballastless track structure has the advantages of high smoothness, strong structural durability, less maintenance workload, low maintenance cost, track structure stability, continuity and long service life.
目前大多数国家普遍铺设双块式无砟轨道和长枕埋入式无砟轨道两种结构，但在轨枕埋置现浇道床时，新老混凝土粘结面易出现粘接面离缝、轻枕松动、开裂等伤损情况。At present, most countries generally lay two types of structures: double-block ballastless track and long-sleeper embedded ballastless track. However, when the sleepers are buried in the cast-in-place ballast bed, the bonding surface between the new and old concrete is prone to damage such as bonding surface separation, loosening of light sleepers, and cracking.
因此，如何设计一种新型埋入式轻枕，增强轨枕本体与现浇道床之间新老混凝土结合面粘结性能，提高轻枕本体与现浇道床的连接强度是本领域技术人员亟需解决的问题。Therefore, how to design a new type of embedded light sleeper, enhance the bonding performance of the new and old concrete interface between the sleeper body and the cast-in-place ballast, and improve the connection strength between the light sleeper body and the cast-in-place ballast is an urgent problem to be solved by technical personnel in this field.
实用新型内容Utility Model Content
本实用新型提供一种无砟轨道埋入式轨枕，解决现有现有无砟轨道铺设后，轻枕与道床之间粘结面离缝较大、连接强度较低的技术问题。The utility model provides an embedded sleeper for a ballastless track, which solves the technical problems that after the existing ballastless track is laid, the gap between the bonding surface of the light sleeper and the roadbed is large and the connection strength is low.
本实用新型解决上述技术问题的技术方案如下，一种无砟轨道埋入式轨枕，包括：轻枕本体及多个连接件，The utility model solves the above technical problems with the following technical solutions: a ballastless track embedded sleeper, comprising: a light sleeper body and a plurality of connecting parts,
所述轻枕本体为长方体结构；多个所述连接件间隔固定在所述所述轻枕本体长度方向相对的两侧。The light pillow body is a rectangular parallelepiped structure; a plurality of connecting members are fixed at intervals on two opposite sides of the light pillow body in the length direction.
本实用新型的有益效果是：通过在轻轨本体长度方向的两侧间隔固定多个连接件，可以增强轨枕本体与现浇道床之间新老混凝土结合面粘结性能，提高轻枕本体与现浇道床的连接强度。The beneficial effect of the utility model is that by fixing a plurality of connecting pieces at intervals on both sides of the length direction of the light rail body, the bonding performance of the new and old concrete bonding surfaces between the sleeper body and the cast-in-place ballast can be enhanced, and the connection strength between the light rail sleeper body and the cast-in-place ballast can be improved.
在上述技术方案的基础上，本实用新型还可以做如下改进。On the basis of the above technical solution, the present invention can also be improved as follows.
进一步，所述连接件为连接钢筋，多个所述连接钢筋均沿所述轻枕本体 的宽度方向预间隔埋在所述轻枕本体的内部，多个所述连接钢筋均伸出所述轻枕本体长度方向相对的两侧。Furthermore, the connecting member is a connecting steel bar, and a plurality of the connecting steel bars are pre-interval-ed and buried inside the light pillow body along the width direction of the light pillow body, and a plurality of the connecting steel bars extend out from two opposite sides of the length direction of the light pillow body.
进一步，多个所述连接钢筋的直径为6-50mm、伸出长度为50-250mm。Furthermore, the diameter of the plurality of connecting steel bars is 6-50 mm and the protruding length is 50-250 mm.
进一步，所述连接件为锚固体，所述锚固体的横截面为三角形、矩形或梯形，多个所述锚固体均一体成型在所述轻枕本体长度方向的相对的两侧。Furthermore, the connecting member is an anchoring body, the cross-section of the anchoring body is triangular, rectangular or trapezoidal, and a plurality of the anchoring bodies are integrally formed on opposite sides of the length direction of the light pillow body.
进一步，多个所述锚固体伸出所述轻枕本体的长度为50-250mm。Furthermore, the length of the plurality of anchor bodies extending out of the light pillow body is 50-250 mm.
进一步，还包括多个预应力钢筋，多个所述预应力钢筋均沿所述轻枕本体的长度方向预埋在所述轻枕本体的内部，多个所述预应力钢筋均伸出所述轻枕本体长度方向的两端。Furthermore, it also includes a plurality of prestressed steel bars, which are all pre-buried inside the light pillow body along the length direction of the light pillow body, and extend out from both ends of the light pillow body in the length direction.
进一步，多根所述预应力钢筋伸出所述轻枕本体的长度为50-250mm。Furthermore, the length of the plurality of prestressed steel bars extending out of the light pillow body is 50-250 mm.
采用上述进一步的有益效果是：通过将多根预应力钢筋固定在轻枕本体的内部并伸出轻枕本体长度方向的两端，一方面可以提高轻枕本体的结构强度，另一方面可以增强轨枕本体与现浇道床之间新老混凝土结合面粘结性能，提高轻枕本体与现浇道床的连接强度。The further beneficial effect of adopting the above method is that by fixing multiple prestressed steel bars inside the light sleeper body and extending them out of both ends of the light sleeper body in the length direction, on the one hand, the structural strength of the light sleeper body can be improved, and on the other hand, the bonding performance of the new and old concrete bonding surfaces between the sleeper body and the cast-in-place ballast can be enhanced, thereby improving the connection strength between the light sleeper body and the cast-in-place ballast.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本实用新型一种无砟轨道埋入式轨枕中类型1侧视图；FIG1 is a side view of a type 1 embedded sleeper for ballastless track according to the present invention;
图2为本实用新型一种无砟轨道埋入式轨枕中类型2侧视图；FIG2 is a side view of type 2 of a ballastless track embedded sleeper according to the present invention;
图3为本实用新型一种无砟轨道埋入式轨枕中类型1的俯视图；FIG3 is a top view of type 1 of a ballastless track embedded sleeper according to the present invention;
图4为本实用新型一种无砟轨道埋入式轨枕中类型2的俯视图；FIG4 is a top view of type 2 of a ballastless track embedded sleeper according to the present invention;
图5为本实用新型一种无砟轨道埋入式轨枕中类型3的俯视图；FIG5 is a top view of type 3 of a ballastless track embedded sleeper according to the present invention;
图6为本实用新型一种无砟轨道埋入式轨枕中类型4的俯视图。FIG. 6 is a top view of type 4 of a ballastless track embedded sleeper according to the present invention.
附图中，各标号所代表的部件列表如下：In the accompanying drawings, the components represented by the reference numerals are listed as follows:
1、轻枕本体，2、连接件，3、预应力钢筋。1. Light pillow body, 2. Connectors, 3. Prestressed steel bars.
具体实施方式Detailed ways
以下结合附图对本实用新型的原理和特征进行描述，所举实例只用于解释本实用新型，并非用于限定本实用新型的范围。The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
如图3-5所示，一种无砟轨道埋入式轨枕，包括：轻枕本体1及多个连接件2，As shown in Figures 3-5, a ballastless track embedded sleeper includes: a light sleeper body 1 and a plurality of connecting parts 2,
轻枕本体1为长方体结构；多个连接件2间隔固定在轻枕本体1长度方向相对的两侧。The light pillow body 1 is a rectangular parallelepiped structure; a plurality of connecting members 2 are fixed at intervals on two opposite sides of the light pillow body 1 in the length direction.
在一些具体实施例中，连接件2可以为连接钢筋，多个连接钢筋均沿轻枕本体1的宽度方向预间隔埋在轻枕本体1的内部，多个连接钢筋均伸出轻枕本体1长度方向相对的两侧。In some specific embodiments, the connecting member 2 can be a connecting steel bar, and multiple connecting steel bars are pre-interval-buried inside the light pillow body 1 along the width direction of the light pillow body 1, and multiple connecting steel bars extend out from opposite sides of the light pillow body 1 in the length direction.
在一些具体实施例中，多个连接钢筋的直径可以为6-50mm、伸出长度可以为50-250mm。In some specific embodiments, the diameter of the plurality of connecting steel bars may be 6-50 mm, and the protruding length may be 50-250 mm.
在一些具体实施例中，连接件2可以为锚固体，锚固体的横截面为三角形、矩形或梯形，多个锚固体均一体成型在轻枕本体1长度方向的相对的两侧。In some specific embodiments, the connecting member 2 may be an anchoring body, the cross section of which is triangular, rectangular or trapezoidal, and a plurality of anchoring bodies are integrally formed on opposite sides of the light pillow body 1 in the length direction.
在一些具体实施例中，多个锚固体伸出轻枕本体1的长度可以为50-250mm。In some specific embodiments, the length of the multiple anchor bodies extending out of the light pillow body 1 can be 50-250 mm.
在一些具体实施例中，还可以包括多个预应力钢筋3，多个预应力钢筋3均沿轻枕本体1的长度方向预埋在轻枕本体1的内部，多个预应力钢筋3均伸出轻枕本体1长度方向的两端。In some specific embodiments, multiple prestressed steel bars 3 may also be included. The multiple prestressed steel bars 3 are all pre-buried inside the light pillow body 1 along the length direction of the light pillow body 1, and the multiple prestressed steel bars 3 extend out from both ends of the length direction of the light pillow body 1.
在一些具体实施例中，多根预应力钢筋3伸出轻枕本体1的长度可以为50-250mm。In some specific embodiments, the length of the plurality of prestressed steel bars 3 extending out of the light pillow body 1 can be 50-250 mm.
以上仅为本实用新型的较佳实施例，并不用以限制本实用新型，凡在本实用新型的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

  1. 一种无砟轨道埋入式轨枕，其特征在于,包括：轻枕本体(1)及多个连接件(2)，A ballastless track embedded sleeper, characterized by comprising: a light sleeper body (1) and a plurality of connecting parts (2),
    所述轻枕本体(1)为长方体结构；多个所述连接件(2)间隔固定在所述所述轻枕本体(1)长度方向相对的两侧。The light pillow body (1) is a rectangular parallelepiped structure; a plurality of connecting members (2) are fixed at intervals on two opposite sides of the light pillow body (1) in the length direction.
  2. 根据权利要求1所述的一种无砟轨道埋入式轨枕，其特征在于，所述连接件(2)为连接钢筋，多个所述连接钢筋均沿所述轻枕本体(1)的宽度方向预间隔埋在所述轻枕本体(1)的内部，多个所述连接钢筋均伸出所述轻枕本体(1)长度方向相对的两侧。According to the embedded sleeper for ballastless track as described in claim 1, it is characterized in that the connecting member (2) is a connecting steel bar, and a plurality of the connecting steel bars are pre-spaced and buried inside the light sleeper body (1) along the width direction of the light sleeper body (1), and a plurality of the connecting steel bars extend out from two opposite sides of the light sleeper body (1) in the length direction.
  3. 根据权利要求2所述的一种无砟轨道埋入式轨枕，其特征在于，多个所述连接钢筋的直径为6-50mm、伸出长度为50-250mm。The embedded sleeper for ballastless track according to claim 2 is characterized in that the diameter of the plurality of connecting steel bars is 6-50 mm and the protruding length is 50-250 mm.
  4. 根据权利要求1所述的一种无砟轨道埋入式轨枕，其特征在于，所述连接件(2)为锚固体，所述锚固体的横截面为三角形、矩形或梯形，多个所述锚固体均一体成型在所述轻枕本体(1)长度方向的相对的两侧。According to the embedded sleeper for ballastless track as described in claim 1, it is characterized in that the connecting member (2) is an anchor body, the cross-section of the anchor body is triangular, rectangular or trapezoidal, and a plurality of the anchor bodies are integrally formed on opposite sides of the length direction of the light sleeper body (1).
  5. 根据权利要求4所述的一种无砟轨道埋入式轨枕，其特征在于，多个所述锚固体伸出所述轻枕本体(1)的长度为50-250mm。The embedded sleeper for ballastless track according to claim 4 is characterized in that the length of the plurality of anchor bodies extending out of the light sleeper body (1) is 50-250 mm.
  6. 根据权利要求1所述的一种无砟轨道埋入式轨枕，其特征在于，还包括多个预应力钢筋(3)，多个所述预应力钢筋(3)均沿所述轻枕本体(1)的长度方向预埋在所述轻枕本体(1)的内部，多个所述预应力钢筋(3)均伸出所述轻枕本体(1)长度方向的两端。According to the embedded sleeper for ballastless track as described in claim 1, it is characterized by further comprising a plurality of prestressed steel bars (3), wherein the plurality of prestressed steel bars (3) are all pre-buried inside the light sleeper body (1) along the length direction of the light sleeper body (1), and the plurality of prestressed steel bars (3) extend out from both ends of the length direction of the light sleeper body (1).
  7. 根据权利要求6所述的一种无砟轨道埋入式轨枕，其特征在于，多根所述预应力钢筋(3)伸出所述轻枕本体(1)的长度为50-250mm。The embedded sleeper for ballastless track according to claim 6 is characterized in that the length of the plurality of prestressed steel bars (3) extending out of the light sleeper body (1) is 50-250 mm.
PCT/CN2022/128117 2022-10-09 2022-10-28 Embedded sleeper for ballastless track WO2024077669A1 (en)

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CN202222641786.8 2022-10-09
CN202222641786.8U CN218580370U (en) 2022-10-09 2022-10-09 Ballastless track embedded sleeper

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Citations (10)

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CN109457549A (en) * 2018-12-17 2019-03-12 中铁第四勘察设计院集团有限公司 Frame-type connection reinforcing structure between the concrete filled steel tube and sleeper block of non-fragment orbit
CN212560938U (en) * 2020-06-05 2021-02-19 中铁二院工程集团有限责任公司 A sleeper for ballastless track protects wheel rail installation
CN216006448U (en) * 2021-06-03 2022-03-11 中国铁道科学研究院集团有限公司铁道建筑研究所 Concrete sleeper of ballastless track with high bonding performance
CN216378947U (en) * 2021-11-01 2022-04-26 中铁第四勘察设计院集团有限公司 Long sleeper suitable for subway

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR521294A (en) * 1914-03-16 1921-07-09 Ralph John Wells Improvements made to the construction of reinforced concrete railway sleepers
EP0440597A1 (en) * 1990-01-30 1991-08-07 Allgemeine Baugesellschaft - A. Porr Aktiengesellschaft Superstructure and substructure of railway bed for rail vehicles
CN202323570U (en) * 2011-12-06 2012-07-11 乐昌市安捷铁路轨枕有限公司 Barbell-shaped sleeper
CN203034311U (en) * 2012-12-28 2013-07-03 中国铁道科学研究院铁道建筑研究所 Sleeper for ballastless track
CN204959483U (en) * 2015-09-17 2016-01-13 铁道第三勘察设计院集团有限公司 Tram ballastless track is short sleeper of concrete for system
CN109183524A (en) * 2018-08-30 2019-01-11 广州地铁设计研究院股份有限公司 A kind of ballastless track long sleeper suitable for urban track traffic
CN109457549A (en) * 2018-12-17 2019-03-12 中铁第四勘察设计院集团有限公司 Frame-type connection reinforcing structure between the concrete filled steel tube and sleeper block of non-fragment orbit
CN212560938U (en) * 2020-06-05 2021-02-19 中铁二院工程集团有限责任公司 A sleeper for ballastless track protects wheel rail installation
CN216006448U (en) * 2021-06-03 2022-03-11 中国铁道科学研究院集团有限公司铁道建筑研究所 Concrete sleeper of ballastless track with high bonding performance
CN216378947U (en) * 2021-11-01 2022-04-26 中铁第四勘察设计院集团有限公司 Long sleeper suitable for subway

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